Which color rope or ribbon is commonly used to designate contaminated areas?

• A. Yellow and magenta rope/ribbon
• B. Red rope
• C. Blue rope
• D. Both yellow and magenta rope/ribbon

Answer: (D)

Contaminated areas are marked with high-visibility color cues that quickly signal risk and the need for special procedures. The yellow and magenta combination on rope or ribbon is the standard designation for contamination boundaries. Together, these colors create a stark, unmistakable signal that an area may be contaminated and requires decontamination readiness, entry controls, and appropriate protective measures before crossing the boundary. Red rope is typically used for general danger or prohibition, blue for information or safety equipment, and yellow alone signals caution without specifically indicating contamination. Using both yellow and magenta provides the clearest, most universally understood indication of a contaminated area.